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Ray Alexander Sangster, 21, was arrested Saturday for leaving the crash scene at the intersection of Southwest Ninth Street and Porter Avenue.

Witnesses told police Sangster was driving a white truck when he pulled onto Southwest Ninth Street in an "aggressive manner."

"There was a truck that was driving northbound in a reckless manner, and it struck the victim," said Des Moines police Sgt. Paul Parizek. "It kind of slowed down to the point where witnesses thought he was going to stop, but then he took off and left the area."

Police said Sangster later drove back to the scene but didn't stop.

"That gave witnesses a good opportunity to get a good, detailed description of not only the truck but who was driving," Parizek said.

Ayala, who was bleeding from his head and had broken bones, was left unconscious in the roadway. He was taken to the hospital in critical condition.

"Typically, people stop if they believed they've hurt someone, and the fact that he left is bad enough," Parizek said. "But the fact that he left, came back and left again makes the circumstances even tougher."

Police told KCCI Sangster has since been released from custody after posting bail.